Compass



Jmmgae; mm l '2,026,919

f v COMPASS" Filed March 27, 1954 2 sheets-sheet 2 Patented Jan. 7, 1935. v

. V COMPASS JameslLeslie s ti'ight, Summerside, PrinceEdwardY Y* Island,

Canada Application Mar'ehzv, i934, serial No. .117,645 1 -incanaaa-marcnzaisea Y H l y e'ciaims. 'l(o1,sa z2s f This invention. relates .to-compasses and more particularly to Vthat type` familiarlyfknownfas,V

marine compasses.

In many compasses-of the 4`typical gimbal 5 hung type, a short cross lin aV rough pitching sea,

sets the.v compass into erratic `.motion 1with the. Y result that so;long `Vas vsuch-condition prevails great danger Vexistsv since a definiteai'idV true..

/ With the present1 invention, experiencezhas shown, that my improved compassfdue to its construction and arrangement, is not subjecttoA erratic motion -even though the'vessel maybe rollingfancl tossing ,-in-,afrough sea.

One' of `the objects ofthe ypresent invention -i therefore isA to provide a compass `ofthis char--Y acter whichrwill maintain a stable position and give accurate readings in Vrough seas.

Another object of the invention is to provide a `compass of this character with; improved gravi` tationalbalance.y l

Arfurther object of the invention is toA provide va compass of this character whereinmeans are provided to take care of the -expansionand Vcon-iY traction offthe liquid whichthe elements are submerged.V

Still a further object of the present inventionV is to providega compass of thistype composedof relatively few elements andwherein the various parts Vwill theV more effectively perform the func' tions requiredof them. Y Y. p

With the foregoing and otherY objects in. view novel combination and arrangement. of Vparts hereinafterdescribed"in detail and illustrated in.4v

thel accompanyingv drawings in which;`

Fig. Lis a sectional Velevation taken the centre of my improved compass,

the

.'Figs. 5 and 5a isrianeievancnand pianview.'

respectively of the pressureV chamber, and

Figsg and 6d is `an elevation and planvew re`A spectively of the mounting between the supporting frame andthe compass"bowl. Referring now to the details of structure illusf trated inthe drawings Vwherein like letters and numerals of reference indicate 'correspondingpartsin the' various views,LA designates a. support f that the base of section `24.1s provided with an frame orV standl upon which the. compass as a lower and upper sections l0 and Il respectively,

the former being of metal and the latter being through of mounting it is apparent that vrnotwithstanding une '2' 2 of' change offposition ,of the outer frame with re-f scribed, which extend through the ring ISandthe jrI5 iiange I4 of thesectionf I0; Y l

At the base of section VIll I provide an openingf ,I5 which isfclosed byfatransparent member I6 fwhich formsa light port at the base of the sec` tio'n.` Immediatelyvbelo'w the member 'I6l is a 10 compensator case I1 within which are v:bars I8 f andil I9 Vhaving .mountedfthereon steel. magnet r sleeves 20 and-.2| which are adjustable through V adjustingscrews22 and23.V The magnets infthis Y instance are provided for .correcting the compass V1li Yreaclingatiid compensating when artificial or other'magnetic iniluence causesdeection.

. Sections .'lland Il, when joined, provide a spherical housingV andV have mounted therewithini the inner case C.'.This inner case is also com- 20 posed oflower and Vupper sections indicated by l the numerals 24 Aand 25.. TheA lower section is' preferably of metal whilethe upper section. comprisestwo Adomes of transparent material 26 -and 21 which form an air or evacuated space 28`25 therebetween A The formation of theV air space in' the upper section of the inner casing renders theinner casing as awhole lighter and more buoyant and when combined with the heavier, metallic, lower 30 section 'accelerates responsive movement (of the.

casing togravitatioi'iai iniiuence. y which will become appara `t asthedescription y proceeds, the invention consists essentiallyin the The mountingof 'the caseC is effectedrthrough.

`girnbal` ring 29whichis supported byrg'imbals or4 `trunnions 3llfand 3| connected to the casing v'Ill land by gimbals or trunnions 32 and'33 mounted on the Vsections 24; With this particular type 1 spect to the,v horizontal, themember C with instrumentalities thereinwill maintain Va level po` sition.

From the description far given. it will be',

' seen i that the gimbal mounting in combination 45. Q with they arrangementof the weight, of. thesections, previously mentioned, lend free action` tov the natural gravitational pull exerted andthereby enables the case and compass card therewithin. Y

. to maintain a level, stable positie-nat all .times'50 eventhough the vesselbe constantly rolling and i fpitching in f'rough seas. s

Revertingagain to Fig#A I it willrbe observed j opening which is closed bya transparent hood 55 "andicap 35 and-.36 respectively. The hoodand Energy for the bulb 31 is preferably conducted 00 tioned andnow rei'erred to in d to damp vibration or shock whi/o would normally be transmitted to the compass. This structure Y terminal ,extending through gimbal 8|.-insulated conductors Il, Il and 42, the latter oonnecting with terminal 4I which in turn communicat with contact M- connecting the light bulb.4

from a suitable source is communicated to terminal 8l. l

Support means for` the compass card comprises a spindle screw or pin Il mounted in the head oi nut Al, the aperture between these elements beingsealedbypackingoragashetll. Positioned abovethehoodisanadlustablereiiector.

4l while immediately above the redector the compass card proper is mounted. Y

'nre mounting and component parts o! the compass include aicwcl clip Il adiustably supported' on the spindle Il Within the Jewel cup Iprovideaiewelilupon whiehtlnpivotory crown piniiis mounted. .'Iheipivot pin is provided with locking chucks!! andis carried by 'the spider Il which in tum carries the compass card Il. 'I'he locking chucks I2 are designed to preventithe pivot from, displaced or disconnected i'rom the ltowel cup should the cornpassbeinverted.

Thecompasscardaswillbeseenbyrei'erence' tovFlg. 3 is or the open type, light in'weight, and

preferably transparent. 'Ihe various markingsor indicia thereon, which are too well known to require description, are opaque. thus theycon-V trast with the light raysand cause the markings to become clearly legible. Having regard to the acompass card'light inweight which reduces overswingtoa minimumandatthesametime renders the markings more clearly visible.

In addition to acting as a support-meansi'or nets themselves which are identiiled by nu- A rer-o or other relative marking may be in- -scribedontheinnerwaiiorsurraceoithe case C: A v

The mounting of the'case B, previously menembodies a series of connectors` Il composed ot legs il supported on 4the stand or frame A and core it connected by screw or other suitable means Il'to the outer case and-ring II. 'Ihe intermediary sections 62 of the connectors possess ilexibility and may be d'enned as yrubber or like substance.

Under normal operation both the outer and inner are illled with a'liquid and communication isestablished therebetween by means o! a series ci'l oriilces II. (See Fig. l.) provisior an equaliaed pressure is maintained on both sides of the inner case notwithstanding oontraction or expansion which may occur.

In addition to the establishment of a Vbalance for the case C Ifprovide means iormaintaining a constant supply of liquid. This'means comprises a chamber u conveniently transparent, illled approximately one quarter with liquidand -tllree qllrl'els with all'. With this-Drticular arrangement any expansion or contraction inthe liquid is taken care of and the case is constantly is-designed By such PromtheioregoingitwillbeseenthatIhave g' developed a marine compass. simple and novel in structure, which responds readily to changed conditions, balances quickly and evenly due to structural quslitiesand arrangement and mainoi! the'hood Il and-secured therein by meanstainsaconstantsupplyofliquidinthecase. 1n "Manychangesmaybemadeintheaboveand many apparently dinerent embodiments constructed without departing from the spirit or scope thereof. It is intended therefore that all matter contained herein shall be interpreted as 1|.

, tablish communication'between thecasings. a

compass cardv in the inner casing, a Jewel cup supported by the inner casing providing a pivot mounting for the card. magnetic means associated with the card. adjustable compensating magnets so `associatedrwith the outer casing and reservoir meanstormaintainingasupplyorliquidinthe foregoing it will be evident that I have provided 2. Inamarineeompasaanoutercssingtormed with a transparenttopsecti'on and a relatively heavy bottom section, an inner casing gimbal hung within the Aouter casing and .formed with a transparentpmsection vand a relatively heavy bottom said transparent topv section of the inner f med withv an air il spacetorenderthesaidcasingmorebuoyantand responsive to gravitational influence, a housing carried bythe innercasing, a jewel cup sup ported by the'housing, a compass'ca'rd carried by the Jewel cup.a light within the housing and 45.

a light deilecting member mounted between the saidiewelcupandthesaidhousingadaptedto directravsi'romthesaidlighttotheouterpe- .riphery ot the compass card.

8. In a marine compa., the combination oi').v Y an outer casing formed with a transparent top and illled with a liquid, aninner casing within and gimbal hung in spaced relation to the outer casing and formed with a relatively light, transparent top and a relatively heavy bottom, um said inner casing being formed with liquid communicating passageway's permitting passage of liquid between theouter and inner cssinga, illuminating means in saidvinner casing, hood means sealing theilluminating means from the.

liquid, a compass car-d, a Jewel cup supported v by and within the inner casing,'the said Jewel cup pivotally supporting the said compass card,

means ior vertically adJinting the Jewel cup, msg- 4 y netic. means Aassociated with the compensating magnets associated with the outer Acasing .and reservoir means vexteriorly ol the l casings having communication with the outer velsingmrvnmmtainimrslurr'plyoriicumminsI said casings. Y v

' JAMES LELE BTRIGHT.

compass card. u; 

